Precoding method and device

A precoding and precoding matrix technology, applied in the field of precoding, can solve the problems of difficult construction, inability to apply channels, low system capacity, etc., and achieve the effects of improving system performance, reducing interference between users, and improving performance

Active Publication Date: 2012-07-11
HUAWEI TECH CO LTD
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Problems solved by technology

[0011] Although the data sent in the TDMA way can avoid interference, it will lead to low system capacity; for interference al

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0033] In this embodiment, a method for achieving rate maximization through precoding in a distributed MIMO (Multiple-input Multiple-output) system is used to describe the technical solution claimed in the present invention. Among them, the sum rate means that in the MIMO system, by reducing the interference between users, multiple signals are sent jointly in one channel. The larger the sum rate is, the more data is sent in the channel per unit time, and the system ...

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Abstract

The invention relates to a precoding method and a precoding device. The corresponding method comprises the following steps of: constructing a Lagrange function according to a precoding matrix, a transmitting power, a receiving filer matrix and a weighting matrix and obtaining a Lagrange multiplier by the Lagrange function; according to the Lagrange multiplier, updating the precoding matrix to obtain an iterative precoding matrix and an iterative receiving filter matrix; obtaining an iterative Lagrange multiplier according to the iterative precoding matrix, the transmitting power, the iterative receiving filter matrix and the weighting matrix and updating an iteration mode of the iterative precoding matrix by the iterative Lagrange multiplier and repeating the steps until the iterative precoding matrix is converged to a threshold value; and according to the iterative precoding matrix converged to the threshold value, carrying out precoding on information to be transmitted. The precoding method and the precoding device have the characteristics of improving the performance of a multi-user interference system, reducing interference among users and reducing information transmission and information sharing which are required by cooperative communication of the users. The interference among the users can be effectively reduced and the performances of the system and the speed are improved.

Description

technical field [0001] The invention relates to the field of communication technology, and relates to a method and device for realizing precoding in a distributed MIMO system. Background technique [0002] In a wireless communication system, the signals of different users interfere with each other. In a Gaussian interference channel, each user knows their own complete channel information, but data cannot be shared between users, and joint transmission cannot be performed. figure 1 shows a two-user Gaussian interference channel, at user x 1 and x 2 There is interference between them. While eliminating the interference between users, how to increase the capacity of the Gaussian interference channel has always been one of the main bottlenecks restricting the development of technology. [0003] With the in-depth study of Gaussian interference channels, a method of using interference alignment to solve mutual interference between users is proposed. Interference alignment is t...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/00
CPCH04B7/0482H04B7/0456H04B7/0617H04B7/0413
Inventor 沈晖李斌罗毅朱胡飞
Owner HUAWEI TECH CO LTD
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